Roof rebuild

[router343]

I have a 1998 Jayco Designer 3120 FKS and I need to replace the roof. I know I will need some new rafters, and plywood. I don't know what thickness plywood to get. I pulled back one piece to see what it was and it looks like 2 layers on top of the truss, 1 st layer 5/8 and top layer that the rubber lays on is 3/8. Is this correct or has a previous owner just laid the 3/8 over the 5/8. I want to do it right while I have every thing off.

[Rustic Eagle]

Good question....., but I had a roof rebuild on my '05' several years ago and recall that there was only one layer of plywood.

If a JOF member can't confirm, I would contact Jayco directly.

Bob

[Jagiven]

Seems odd that Jayco would have two layers of plywood. I would call Jayco up with your VIN number ask about the roof construction and ask if they can send you the build drawings. If they still have the drawings they will send them on.

[clubhouse]

Currently Jayco is using 3/8 plywood roof decking.

5/8 for the flooring

Seems odd to have 2 layers of roof decking, especially in an industry driven by weight and price.

[John LLRV]

If the roof was not level, or there was roof work in the past, standard procedure is to put a new thin layer of plywood over the old to make it level before the rubber roof is put on.

I can look up the specs at work in a few.

[router343]

Thanks for the quick replies. John that would be great if you could look that up, and let me know exactly what I need. It is a 1998 Jayco Designer 3210 FKS

[John LLRV]

Parts search comes up with 5/8 only, but.. From the original print, it looks like there is a 3/16 lauan board first, then set back (for the aluminum) is another 1/8 topper. Jayco could have beefed it up on the line, while under production for a heavier duty roof. Or.. could be the interior lauan board for the ceiling.. That would make more sense..

After my ramblings.. it should be only 1 layer of wood. I would go with 5/8 for strength, but you can go 3/8 for ease of work, depending on the distance of the supports.

[router343]

Thanks John. Is there some place I could download these.

[John LLRV]

You can download the one here.. and Jayco has the drawings they can email (i had them email me this one)

[John LLRV]

But.. if you run into problems.. shoot me a line.. I can get them if Jayco wont give them to you.

[router343]

Thanks for the help. Turns out that there were not 2 layers of plywood. What I was seeing on the edge was just a piece of 5/8 trim that set into the slots of the rafters for the deck to lay on. I ended up going back with 7/16 OSB ( hope I did not make mistake). Now I have 2 new questions. 1. Does the new EPDM go under the front cap and over the rear cap?. 2. I need to replace the trim pieces that screw down over the front and rear caps to hold them in place, not sure what to buy the old ones were in bad shape with years of crap on them. Is there a part number for them and what are they called? im sorry one more question, does anyone know where I can get a detailed parts catalog for my trailer, Jayco said they only make them available to dealers.

[msturtz]

I would never use OSB on a roof...unless I had no other choice. If it gets wet it turns into mush.

[norty1]

Not the OSB we use.

[John LLRV]

The new roof should go under both the front and rear cap. Utilize Lap Sealant along those seams. The trim pieces I can look up, as soon as the Jayco site comes back up (crashed a few hours ago...)

[router343]

Part number I was able to get from Jayco is 0068145, but I searched that part number online and it doesn't come up with anything.

[John LLRV]

Let me plug it into Jayco's part listing tomorrow.

[router343]

seems to be about $17.00 for each 104" piece, but shipping is around $80.00. I guess I will have to just try and straighten and clean the old ones,

[John LLRV]

See if they can cut them into shorter pieces for you. Saves on shipping cost, and since its for the roof, no one will see the seam.

[John LLRV]

Valid Part Number... 0068145.. TRIM,FLAT OFFSET 104" NW E2719

Where are you buying these from? I can tell you that the price you found is has over a 50% mark up... before shipping.

John

[router343]

i did not buy any, just trying to clean and straighten the ones i have. Every place i call says they have to order them and shipping is to high for me. Everything is done on the roof other than putting these pieces on. Weather has turn cold again so, i just put a tarp over it for now.